The war in Afghanistan is already estimated to have cost nearly $2 trillion even as President Donald Trump vows to beef up American military presence in that nation, CNN reports.

The total estimate for 16-years of conflict comes from Neta Crawford, co-director of the Cost of War Project. Crawford said total war spending in Afghanistan, Iraq and Pakistan since 2001 totals about $5 trillion, according to CNN.

Crawford's group at Brown University estimated the total cost for Afghanistan alone to be $783 billion through the end of fiscal year 2016, NBC News reported.

But the number soars to just under $2 trillion once long-term spending like veterans' care and other factors are included, according to Crawford's group.

"The current wars have been paid for almost entirely by borrowing," the group noted on its website.

And, the Cost of War Project estimated all the conflicts have an impact on the U.S. economy.

"This borrowing has raised the U.S. budget deficit, increased the national debt, and had other macroeconomic effects, such as raising consumer interest rates," it noted. "Unless the U.S. immediately repays the money borrowed for war, there also will be future interest payments. We estimate that interest payments could total over $7.9 trillion by 2053."

Meanwhile, Anthony Cordesman, the Arleigh A. Burke Chair in Strategy at the Center for Strategic and International Studies, puts the Afghanistan conflict's cost at $841 billion, CNN reported. Cordesman said the estimate includes Trump's budget request for next year.